from idlelib.debugobj import myrepr


class Dog():
    """一次模拟小狗的简单尝试"""
    def __init__(self, name, age):
        """初始化属性name和age"""
        self.name = name
        self.age = age
    def sit(self):
        """模拟小狗被命令时蹲下"""
        print(self.name.title() + " is now sitting.")
    def roll_over(self):
        """模拟小狗被命令时打滚"""
        print(self.name.title() + " rolled over!")

def dog_test():
    my_dog=Dog('Wolf', 19)
    print(my_dog.sit())
    print(f'my dog age is {my_dog.age}')

if __name__ == '__main__':
    dog_test()